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Tradescantias, in general, need very bright light out of the direct sun’s rays that can burn their leaves. So the best indoor location is an east- or north-facing window with good light but not direct sun.
Your Lilac will grow best in average household temperatures between 65- and 75 degrees F. You must be careful, though, to keep your plants away from cold drafts through winter windows or air conditioner vents.
Tradescantias enjoy seasonal high humidity, around 50 percent, but they can live comfortably in average household humidity, which is about 20 to 30 percent.